Limas S.PQR
T titik berat segitiga alas
PT = 2/3 tinggi PQR
PT = 2/3 × PQ sin Q
PT = 2/3 × 10 × 1/2 √3
PT = 10/3 √3 cm
TS
= √(PS² - PT²)
= √(13² - 300/9)
= 1/3 √1221 cm
Perhatikan segitiga STQ
jarak T ke SQ
= TS × TQ /SQ
= 1/3 √1221 × 10/3 √3 / 13
= 1/3 × √3 × √407 × 10/3 √3 / 13
= 10/39 √407 cm
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Limas S.PQR
T titik berat segitiga alas
PT = 2/3 tinggi PQR
PT = 2/3 × PQ sin Q
PT = 2/3 × 10 × 1/2 √3
PT = 10/3 √3 cm
TS
= √(PS² - PT²)
= √(13² - 300/9)
= 1/3 √1221 cm
Perhatikan segitiga STQ
jarak T ke SQ
= TS × TQ /SQ
= 1/3 √1221 × 10/3 √3 / 13
= 1/3 × √3 × √407 × 10/3 √3 / 13
= 10/39 √407 cm